Syria's "bottom line" for peace with Israel is the return of all the land seized from it by Israel in June 1967

Report by Fred Hof at the USIP, here

'...Syria's "bottom line" for peace with Israel is the return of all the land seized from it by Israel in June 1967. This includes the Golan Heights plateau and small tracts in the Jordan River Valley--acreage that adjoins bodies of water vitally important to Israel's economy and of marginal use to Syria....Rejecting the argument that peace with Israel obliges it to break relations with others, Damascus has indicated that an American presence at the peace talks would produce direct Syrian-Israeli interactions and that a drastically improved Syria-U.S. bilateral relationship must be a by-product of Syrian-Israeli peace..."